實踐 Cards - Components - Material design guidelines 文檔中 Card raised elevation 效果。

Card elevation

build.gradle

compile 'com.android.support:cardview-v7:25.3.1'

layout/activity_main.xml

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:stateListAnimator="@drawable/card"
    android:clickable="true"
    cardview:cardElevation="2dp">

    ...

</android.support.v7.widget.CardView>

drawable/card.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
        
    <item android:state_enabled="true" android:state_pressed="false">
        <objectAnimator
            android:duration="@android:integer/config_shortAnimTime"
            android:propertyName="translationZ"
            android:valueTo="0dp"
            android:valueType="floatType" />
    </item>
    
    <item android:state_enabled="true" android:state_pressed="true">
        <objectAnimator
            android:duration="@android:integer/config_shortAnimTime"
            android:propertyName="translationZ"
            android:valueTo="8dp"
            android:valueType="floatType" />
    </item>

</selector>